Automatic range containment system

An automatic range containment system discriminating against background obstructions within a sensor field of view, which comprises:

• (a) means for receiving a signal from a target sensor, for completing a connection providing power to said system, and for generating a turn-on pulse;
• (b) a containment interval timer electrically coupled to said intrusion timer and initiated by the turn-on pulse, said interval timer having an on-time adapted to enable said system detection range to be reduced to a value less than the range of a non-target obstacles appearing in the sensor's field-of-view;
• (c) a transmitter oscillator in combination with clock-generating pulses;
• (d) a range containment timer electrically coupled to said transmitter oscillator and initiated by said pulses;
• (e) a range gate electrically connected to a first gate and a range setback timer initiated by range-gated, reflected pulses from said transmitter oscillator, in which said range setback timer is also initiated at said turn-on pulse;
• (f) a range counter electrically coupled to a second gate for counting and totalling a signal passed through said second gate;
• (g) a digital-to-anaolg converter coupled to the output of said range counter for converting the signals from the range counter to said range containment timer and providing a range control causing the system to reduce operational range if background obstructions appear within the sensor's field of view.